Siemens SIMATIC ET 200MP Equipment Manual page 71

Response times
B.1 Response times of the ET 200MP
Example configuration for the calculation of the backplane bus cycle time
The following are used in the example:
Table B- 1 Example configuration for the calculation of the backplane bus cycle time
I/O module
Analog output module AQ 4xU/I ST
Analog output module AQ 4xU/I ST with value
status
Digital output module DQ 32x24VDC/0.5A ST
with value status
Digital input module DI 32x24VDC HF
Analog input module AI 8xU/I/RTD/TC ST
Sum
Example calculation of the backplane bus cycle time
Backplane bus cycle time in μs:
• (20 + 3) x 0.0668 + 1.6131 = 3.1495 ≈ 4 μs (rounded up)
plus
• (25 + 4) x 0.0959 + 2.5901 = 5.3712 ≈ 6 μs (rounded up)
plus
• Operating system processing time 500 μs
Result of backplane bus cycle time
Backplane bus cycle time = 510 μs
Calculating the response time
It is necessary to differentiate between two cases when calculating the response time of the
IM 155-5 MF HF:
• Case 1: The configured update time is greater than/equal to the backplane bus cycle time.
Then:
Response time in μs = backplane bus cycle time + configured update time
• Case 2: The configured update time is less than the backplane bus cycle time.
Then:
Response time in μs = backplane bus cycle time + (configured update time x (backplane
bus cycle time / configured update time)).
If the division of backplane bus cycle time / configured update time does not return an
integer without remainder, an additional configured update time must be added next to
the integer in the bracket.
70
Output data Input data
in bytes in bytes
8 -
8 1
4 4
- 4
- 16
20 25
Interface module IM 155-5 MF HF (6ES7155-5MU00-0CN0)
Number of out- Number of input
put addresses addresses
1 -
1 1
1 1
- 1
- 1
3 4
Equipment Manual, 11/2023, A5E53268530-AA